Implement trimTo function

iplayer · Sep 1, 2014 · d8be773 · d8be773
1 parent 5ee9f2f
commit d8be773
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -138,10 +138,16 @@ addEpisode(n)
 ```
 Add an episode in position `n`, plucked randomly from the Pool, also ups the count for the programme. Returns the episode added.
 
+```javascript
+trimTo(n)
+```
+
+Removes all but the first `n` child episodes.
+
 ```javascript
 removeAllItems()
 ```
-Removes all child episodes and sets the count of episodes to 0.
+Removes all child episodes and sets the count of episodes to 0 (alias for `trimTo(0)`).
 
 ### Group
 

diff --git a/lib/Fixture.js b/lib/Fixture.js
@@ -26,7 +26,12 @@ function Fixture(name, data, elementPool, config, fixtureName) {
 /* Instance Methods */
 
 Fixture.prototype.removeAllItems = function() {
-    this.elementsArray.splice(0,this.elementsArray.length);
+    this.trimTo(0);
+};
+
+Fixture.prototype.trimTo = function(length) {
+    var total = this.elementsArray.length;
+    this.elementsArray.splice(length, total-length);
 };
 
 Fixture.prototype.getElement = function (num) {